getresgidgetresuidsetresgidsetresuid
- get or set real, effective and saved user or group ID
LIBRARY
Lb libc
SYNOPSIS
#include <sys/types.h>
#include <unistd.h> int
getresgid (gid_t *rgid gid_t *egid gid_t *sgid); int
getresuid (uid_t *ruid uid_t *euid uid_t *suid); int
setresgid (gid_t rgid gid_t egid gid_t sgid); int
setresuid (uid_t ruid uid_t euid uid_t suid);
DESCRIPTION
The
setresuid ();
system call sets the real,
effective and saved user IDs of the current process.
The analogous
setresgid ();
sets the real, effective and saved group IDs.
Privileged processes may set these IDs
to arbitrary values.
Unprivileged processes are restricted
in that each of the new IDs must match one of the current IDs.
Passing -1 as an argument causes the corresponding value
to remain unchanged.
The
getresgid ();
and
getresuid ();
calls retrieve the real, effective, and saved group and user IDs of
the current process, respectively.
RETURN VALUES
Rv -std
ERRORS
Bq Er EPERM
The calling process was not privileged
and tried to change one or more IDs to a value
which was not the current real ID, the current effective ID
nor the current saved ID.
Bq Er EFAULT
An address passed to
getresgid ();
or
getresuid ();
was invalid.
